#include <stdio.h>
#include <pic_opt/picture_opt.h>
#include <jpeg/jpeg.h>
#include <jpeg/libjpeg/jpeglib.h>
#include <setjmp.h>
#include <string.h>
#include <stdlib.h>
#include <alloc.h>
#include <errno.h>
#include <config.h>

struct my_error_mgr {
    struct jpeg_error_mgr pub;    /* "public" fields */

    jmp_buf setjmp_buffer;        /* for return to caller */
};

typedef struct my_error_mgr *my_error_ptr;
/*
 * Here's the routine that will replace the standard error_exit method:
 */

METHODDEF(void)
my_error_exit (j_common_ptr cinfo)
{
    /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
    my_error_ptr myerr = (my_error_ptr) cinfo->err;

    /* Always display the message. */
    /* We could postpone this until after returning, if we chose. */
    (*cinfo->err->output_message) (cinfo);

    /* Return control to the setjmp point */
    longjmp(myerr->setjmp_buffer, 1);
} 


int jpeg_parser_display(char *dir,SHEET *sht,int scaleType)
{
    UNUSED(scaleType);

    if(dir == NULL)
        return FALSE;
    /* This struct contains the JPEG decompression parameters and pointers to
    * working space (which is allocated as needed by the JPEG library).
    */
    struct jpeg_decompress_struct cinfo;
    /* We use our private extension JPEG error handler.
    * Note that this struct must live as long as the main JPEG parameter
    * struct, to avoid dangling-pointer problems.
    */
    struct my_error_mgr jerr;
    /* More stuff */
    FILE *infile = NULL;                 /* source file */
    unsigned char * buffer;            /* Output row buffer */
    int row_stride;               /* physical row width in output buffer */

    /* In this example we want to open the input file before doing anything else,
    * so that the setjmp() error recovery below can assume the file is open.
    * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
    * requires it in order to read binary files.
    */

    if ((infile = fopen(dir, "r")) == NULL) 
    {
        //fprintf(stderr, "can't open %s\n", filename);
        return 1;
    }

    /* We set up the normal JPEG error routines, then override error_exit. */
    cinfo.err = jpeg_std_error(&jerr.pub);
    jerr.pub.error_exit = my_error_exit;
    /* Establish the setjmp return context for my_error_exit to use. */
    if (setjmp(jerr.setjmp_buffer)) 
    {
        //    If we get here, the JPEG code has signaled an error.
        //    * We need to clean up the JPEG object, close the input file, and return.
        jpeg_destroy_decompress(&cinfo);
        fclose(infile);
        return 1;
    }

    /* Now we can initialize the JPEG decompression object. */
    jpeg_create_decompress(&cinfo);

    /* Step 2: specify data source (eg, a file) */

    jpeg_stdio_src(&cinfo, infile);

    /* Step 3: read file parameters with jpeg_read_header() */

    (void) jpeg_read_header(&cinfo, TRUE);
    /* We can ignore the return value from jpeg_read_header since
    *   (a) suspension is not possible with the stdio data source, and
    *   (b) we passed TRUE to reject a tables-only JPEG file as an error.
    * See libjpeg.txt for more info.
    */

    /* Step 4: set parameters for decompression */

    /* In this example, we don't need to change any of the defaults set by
    * jpeg_read_header(), so we do nothing here.
    */


    cinfo.out_color_space = JCS_EXT_BGR;


    jpeg_calc_output_dimensions(&cinfo);

    int shtWidth = sht->bxsize - WIN_LEFT_PADDING - WIN_RIGHT_PADDING;
    int shtHeight = sht->bysize - WIN_TOP_PADDING - WIN_BOTTOM_PADDING;

//    printf("cinfo.output_width = %d, cinfo.output_height = %d\n", cinfo.output_width, cinfo.output_height);

    /* Step 5: Start decompressor */

    (void) jpeg_start_decompress(&cinfo);
    /* We can ignore the return value since suspension is not possible
    * with the stdio data source.
    */

    /* We may need to do some setup of our own at this point before reading
    * the data.  After jpeg_start_decompress() we have the correct scaled
    * output image dimensions available, as well as the output colormap
    * if we asked for color quantization.
    * In this example, we need to make an output work buffer of the right size.
    */
    /* JSAMPLEs per row in output buffer */
    row_stride = cinfo.output_width * cinfo.output_components;

 //   printf("cinfo.output_width = %d\n", cinfo.output_width);
 //   printf("cinfo.output_components = %d\n", cinfo.output_components);

    int pic_size = row_stride * cinfo.output_height;
    /* Make a one-row-high sample array that will go away when done with image */
    buffer = (unsigned char *) malloc(pic_size);

    if(buffer == NULL)
    {
        fclose(infile);
        return ENOMEM;
    }
    /* Step 6: while (scan lines remain to be read) */
    /*           jpeg_read_scanlines(...); */

    /* Here we use the library's state variable cinfo.output_scanline as the
    * loop counter, so that we don't have to keep track ourselves.
    */

    unsigned nCount = 0;

    unsigned char *pTmp = buffer;

    while (cinfo.output_scanline < cinfo.output_height) {
        /* jpeg_read_scanlines expects an array of pointers to scanlines.
        * Here the array is only one element long, but you could ask for
        * more than one scanline at a time if that's more convenient.
        */
        pTmp = buffer + (nCount * row_stride);
        (void) jpeg_read_scanlines(&cinfo, &pTmp, 1);

        //(void) jpeg_read_scanlines(&cinfo, buffer, 1);
        /* Assume put_scanline_someplace wants a pointer and sample count. */
        nCount ++;
        if (nCount > cinfo.output_height)
        {
            fclose(infile);
            return 2;
        }

    }
    unsigned char *dstBuffer = (unsigned char *)malloc(shtWidth*shtHeight*3);
    pic_opt_change_size_by_twoline(buffer,row_stride,cinfo.output_width,cinfo.output_height,dstBuffer,&shtWidth,&shtHeight,1,CENTER_CROP);
    add_to_piclayer_by_rgb565(sht, shtWidth, shtHeight, dstBuffer, -1);

   free(dstBuffer);
    dstBuffer = NULL;

    free(buffer);
    buffer = NULL;
    /* Step 7: Finish decompression */

    (void) jpeg_finish_decompress(&cinfo);
    /* We can ignore the return value since suspension is not possible
    * with the stdio data source.
    */

    /* Step 8: Release JPEG decompression object */

    /* This is an important step since it will release a good deal of memory. */
    jpeg_destroy_decompress(&cinfo);

    /* After finish_decompress, we can close the input file.
    * Here we postpone it until after no more JPEG errors are possible,
    * so as to simplify the setjmp error logic above.  (Actually, I don't
    * think that jpeg_destroy can do an error exit, but why assume anything...)
    */
    fclose(infile);

    /* At this point you may want to check to see whether any corrupt-data
    * warnings occurred (test whether jerr.pub.num_warnings is nonzero).
    */

    /* And we're done! */

    return 0;
}

	
